A comparative study between friction stir processing and friction stir vibration processing to develop magnesium surface nanocomposites
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第8期
论文作者：Behrouz Bagheri Mahmoud Abbasi Amin Abdollahzadeh Amir Hossein Kokabi
文章页码：1133 - 1146
摘 要：Friction stir processing（FSP） can be used to improve surface composites. In this study, a modified method of FSP called friction stir vibration processing（FSVP） was applied to develop a surface composite on AZ91 magnesium alloy. In this technique, the workpiece is vibrated normal to the processing direction. The results illustrated that compared with the FSP method, the FSVP caused a better homogeneous distribution of SiC particles in the microstructure. The results also showed that matrix grains of friction stir vibration processed（FSV-processed） samples（（26.43 ± 2.00） μm） were finer than those of friction stir processed（FS-processed） specimens（（39.43 ± 2.00） μm）. The results indicated that the ultimate tensile strength（UTS） of FSV-processed specimens（361.82 MPa） was higher than that of FS-processed specimens（324.97 MPa）. The higher plastic strain in the material during FSVP, due to workpiece vibration, resulted in higher dynamic recrystallization,and consequently, finer grains were developed. The elongation and formability index of the FSV-processed specimen（16.88% and 6107.52 MPa·%, respectively） were higher than those of the FS-processed sample（15.24% and 4952.54 MPa·%, respectively）. Moreover, the effects of FSVP were also found to intensify as the vibration frequency increased.
Behrouz Bagheri1，Mahmoud Abbasi2，Amin Abdollahzadeh3,4，Amir Hossein Kokabi3
1. Department of Mining and Metallurgy, Amirkabir University of Technology2. Faculty of Engineering, University of Kashan3. Department of Materials Science and Engineering, Sharif University of Technology4. Institute of Materials Engineering and Advanced Processes, Department of Mining and Metallurgy, Amirkabir University of Technology
摘 要：Friction stir processing（FSP） can be used to improve surface composites. In this study, a modified method of FSP called friction stir vibration processing（FSVP） was applied to develop a surface composite on AZ91 magnesium alloy. In this technique, the workpiece is vibrated normal to the processing direction. The results illustrated that compared with the FSP method, the FSVP caused a better homogeneous distribution of SiC particles in the microstructure. The results also showed that matrix grains of friction stir vibration processed（FSV-processed） samples（（26.43 ± 2.00） μm） were finer than those of friction stir processed（FS-processed） specimens（（39.43 ± 2.00） μm）. The results indicated that the ultimate tensile strength（UTS） of FSV-processed specimens（361.82 MPa） was higher than that of FS-processed specimens（324.97 MPa）. The higher plastic strain in the material during FSVP, due to workpiece vibration, resulted in higher dynamic recrystallization,and consequently, finer grains were developed. The elongation and formability index of the FSV-processed specimen（16.88% and 6107.52 MPa·%, respectively） were higher than those of the FS-processed sample（15.24% and 4952.54 MPa·%, respectively）. Moreover, the effects of FSVP were also found to intensify as the vibration frequency increased.
关键词：
